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Volume 13, Number 2—February 2007


Reduced Efficacy of Insecticide-treated Nets and Indoor Residual Spraying for Malaria Control in Pyrethroid Resistance Area, Benin

Raphael N’Guessan*, Vincent Corbel†, Martin Akogbéto‡§, and Mark RowlandComments to Author 
Author affiliations: *London School of Hygiene and Tropical Medicine, Cotonou, Benin, West Africa; †Institut de Recherche pour le Developpement, Montpellier, France; ‡University of Abomey-Calavi, Cotonou, Benin; §Centre de Recherche Entomologique, Cotonou, Benin¶London School of Hygiene and Tropical Medicine, London, United Kingdom;

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Table 5

Efficacy of lambdacyalothrin-treated filter papers* to Anopheles gambiae from Ladji, Vkper (fixed for kdr allele) and Kisumu (susceptible) strains†

  Lambdacyalothrin 0.05% (18 mg/m2)–treated filter paper bioassays
  Strains  Slope (SE)  LT50 (95% CI)  LT50 ratio
  Ladji  2.1 (0.2)  10.9 (7.2–14.8)
  Vkper  2.1 (0.2)  14.2 (3.6–25.3)  1.3 (1.0–1.6)
  Kisumu  <1

*In World Health Organization kits.
†As determined by using probit analysis. kdr, knockdown; SE, standard error; CI, confidence interval; LT50 is the exposure time in min to kill 50%.

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